cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-10 of 31 results. Next

A122736 Number of benzenoids with 21 hexagons, C_(3h) symmetry and containing 61+2n carbon atoms.

Original entry on oeis.org

2, 4, 21, 44, 103, 232, 480, 577, 460
Offset: 0

Views

Author

Parthasarathy Nambi, Sep 24 2006

Keywords

Crossrefs

Extensions

Name and offset edited by Andrey Zabolotskiy, Nov 15 2023

A123044 Number of benzenoids with 22 hexagons, C_(3h) symmetry and containing 3n carbon atoms.

Original entry on oeis.org

1, 2, 8, 21, 58, 149, 234, 512, 767, 755
Offset: 21

Views

Author

Parthasarathy Nambi, Sep 25 2006

Keywords

Crossrefs

Extensions

Name and offset edited by Andrey Zabolotskiy, Nov 15 2023

A123104 Number of benzenoids with 22 hexagons, D_(2h) symmetry and containing 2n carbon atoms.

Original entry on oeis.org

1, 3, 3, 6, 16, 19, 24, 30, 30, 50, 90, 62, 163, 37, 81
Offset: 31

Views

Author

Parthasarathy Nambi, Sep 27 2006

Keywords

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Extensions

Name and offset edited by Andrey Zabolotskiy, Nov 15 2023

A123105 Number of benzenoids with 22 hexagons, C_(2h) symmetry and containing 2n carbon atoms.

Original entry on oeis.org

2, 32, 138, 510, 1627, 4641, 12646, 31360, 70888, 144276, 261789, 409747, 524600, 462848, 232842
Offset: 31

Views

Author

Parthasarathy Nambi, Sep 28 2006

Keywords

Crossrefs

Formula

Sum_n a(n) = 2157946 = A121210(22). - Andrey Zabolotskiy, Nov 15 2023

Extensions

Name and offset edited by Andrey Zabolotskiy, Nov 15 2023

A123106 Number of benzenoids with 22 hexagons, C_(2v) symmetry and containing n carbon atoms.

Original entry on oeis.org

4, 8, 56, 54, 211, 178, 770, 493, 2349, 1193, 6479, 2788, 16960, 5908, 40657, 11169, 89378, 19138, 176325, 27984, 311332, 36524, 478536, 35025, 599661, 20387, 517568, 0, 251310
Offset: 62

Views

Author

Parthasarathy Nambi, Sep 28 2006

Keywords

Crossrefs

Formula

Sum_n a(n) = 2652445 = A120991(22). - Andrey Zabolotskiy, Nov 09 2023

Extensions

a(89) = 0 inserted by Andrey Zabolotskiy, Nov 09 2023

A123142 Number of benzenoids with 23 hexagons, C_(2v) symmetry and containing n carbon atoms.

Original entry on oeis.org

2, 9, 33, 38, 235, 124, 704, 435, 2283, 1437, 6954, 3628, 17864, 9528, 43798, 24237, 106293, 53593, 228216, 104754, 431864, 188701, 760883, 300925, 1212591, 373411, 1536669, 305586, 1298746, 129710, 586556
Offset: 64

Views

Author

Parthasarathy Nambi, Oct 01 2006

Keywords

Examples

			If n=64 then the number of benzenoids with 23 hexagons with C_(2v) symmetry is 2.
If n=65 then the number of benzenoids with 23 hexagons with C_(2v) symmetry is 9.
If n=66 then the number of benzenoids with 23 hexagons with C_(2v) symmetry is 33.
If n=67 then the number of benzenoids with 23 hexagons with C_(2v) symmetry is 38.
If n=94 then the number of benzenoids with 23 hexagons with C_(2v) symmetry is 586556.
		

References

  • G. Brinkmann, G. Caporossi and P. Hansen, "A Survey and New Results on Computer Enumeration of Polyhex and Fusene Hydrocarbons", J. Chem. Inf. Comput. Sci., vol. 43 (2003) 842-851. See Table 6 column 7 on page 847.

Crossrefs

A123284 Number of polyhexes with 24 hexagons, C_(2v) symmetry and containing n carbon atoms.

Original entry on oeis.org

2, 34, 37, 173, 155, 657, 482, 2206, 1334, 6510, 3315, 18208, 7804, 47329, 16914, 114779, 33879, 258280, 60786, 532865, 98070, 987689, 137195, 1641862, 166882, 2358366, 146898, 2723100, 77267, 2164650, 0, 966300
Offset: 67

Views

Author

Parthasarathy Nambi, Oct 10 2006

Keywords

Comments

a(98) = 966300 is the last nonzero term. Sum(a(n)) = 12574028 = A120991(24). - Markus Voege, Jan 23 2014

Examples

			If n=67 then the number of polyhexes with 24 hexagons with C_(2v) symmetry is 2.
If n=68 then the number of polyhexes with 24 hexagons with C_(2v) symmetry is 34.
If n=69 then the number of polyhexes with 24 hexagons with C_(2v) symmetry is 37.
If n=70 then the number of polyhexes with 24 hexagons with C_(2v) symmetry is 173.
		

Crossrefs

Extensions

Series corrected a(97)=0 and a(98)=966300; keyword 'fini' by Markus Voege, Jan 23 2014

A123285 Number of fusenes with 22 hexagons, C_(3h) symmetry and containing 3n carbon atoms.

Original entry on oeis.org

1, 2, 8, 21, 60, 160, 281, 655, 1003, 1102
Offset: 21

Views

Author

Parthasarathy Nambi, Oct 10 2006

Keywords

Crossrefs

Extensions

Name and offset edited by Andrey Zabolotskiy, Nov 15 2023

A123286 Number of fusenes with 22 hexagons, D_(2h) symmetry and containing 2n carbon atoms.

Original entry on oeis.org

1, 3, 3, 6, 17, 19, 26, 32, 40, 54, 131, 70, 277, 51, 188
Offset: 31

Views

Author

Parthasarathy Nambi, Oct 10 2006

Keywords

Crossrefs

Extensions

Name and offset edited by Andrey Zabolotskiy, Nov 15 2023

A123287 Number of fusenes with 22 hexagons, C_(2h) symmetry and containing 2n carbon atoms.

Original entry on oeis.org

2, 32, 138, 510, 1630, 4757, 13276, 34345, 81379, 173257, 332556, 549920, 737676, 683310, 375524
Offset: 31

Views

Author

Parthasarathy Nambi, Oct 10 2006

Keywords

Crossrefs

Extensions

Name and offset edited by Andrey Zabolotskiy, Nov 15 2023
Showing 1-10 of 31 results. Next